Colossal zero-field-cooled exchange bias via tuning compensated ferrimagnetic in kagome metals

Exchange bias (EB) is a crucial property with widespread applications but particularly occurs by complex interfacial magnetic interactions after field cooling. To date, intrinsic zero-field-cooled EB (ZEB) has only emerged in a few bulk frustrated systems and their magnitudes remain small yet. Here, enabled by high temperature synthesis, we uncover a colossal ZEB field of 4.95 kOe via tuning compensated ferrimagnetism in a family of kagome metals, which is almost twice the magnitude of known materials. Atomic-scale structure, spin dynamics, and magnetic theory revealed that these compensated ferrimagnets originate from significant antiferromagnetic exchange interactions embedded in the holmium-iron ferrimagnetic matrix due to supersaturated preferential manganese doping. A random antiferromagnetic order of manganese sublattice sandwiched between ferromagnetic iron kagome bilayers accounts for such unconventional pinning. The outcome of the present study outlines disorder-induced giant bulk ZEB and coercivity in layered frustrated systems. © 2024 American Chemical Society.

Keywords

Ferrimagnetism, Metals, Magnetism, Cooling, Temperature range, Synthesis, Holmium, Iron, Antiferromagnetism

Citation

Zhou, H., Cao, Y., Khmelevskyi, S., Zhang, Q., Hu, S., Avdeev, M., Wang, C.-W., Zhou, R., Yu, C., Chen, X., Li, Q., Miao, J., Li, Q., Lin, K., & Xing, X. (2024). Colossal zero-field-cooled exchange bias via tuning compensated ferrimagnetic in kagome metals. Journal of the American Chemical Society, 146(30), 20770-20777. doi.:10.1021/jacs.4c04173

URI

https://doi.org/10.1021/jacs.4c04173
https://apo.ansto.gov.au/handle/10238/15834

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